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Abstract
Dream reports were tape recorded each morning independently for 10 weeks by both members of an adult heterosexual couple who alleged they regularly shared dreams. The transcribed reports were evaluated blind by 12 trained analysts using quantitative dream-content analysis. The couple had identified 13 pairs of dreams (17% of the sample) as shared. The mean percentage content overlap score of these 13 pairs (39.15%) was significantly greater than that of 80 randomly matched pairs of unshared dreams (5.23%). The content overlap scores of each analyst correlated significantly with those of the unblinded male subject (r = .72). The mean probability that the observed overlap in putatively shared dreams was caused by chance was calculated as 1 in 5 billion. Shared dreams appeared to occur in a distinct temporal cycle of 30–35 days. Content overlap between shared dreams was greatest in three of seven categories; objects, themes, and effect.